This issue will generate an error bar as visible above. When clicking the View Details link, you will see an error message similar to the following:
This means that while trying to copy the files for the new script or software Quick Install identified that there were files that share the same name already in the directory you attempted to install to. This is a safety feature to help prevent existing sites from being overwritten inadvertently.
To resolve this issue, ensure first that you are attempting to install it to the correct domain and subdirectory. Then, ensure that there are no files or directories from a previous website still in the directory via File Manager within cPanel.
If there are extra files and directories present, you may move them into a backup directory and re-attempt the install. Once the directory has been cleared of conflicting files, run the installation again.